Contact your credit card providers and inform them what countries you are going to, when you're leaving and even when you will probably be coming back. This will likely protect against security alerts when you use your card abroad.
Let's speak about debit cards, as you possibly can guess there's no doubt that these are by far the most risky card that you can take. Nearly all are tied to your checking accounts, so if they are lost or thieved, all your cash is potentially at risk. Using a credit card, this just can't happen, since the card is simply not attached to your account.
There are numerous banking institutions that provide bank cards. Thus, a method of choosing should be to assess their interest levels. Interest rates differ according to the company you end up picking. Thus, it is necessary to be able to cautiously evaluate the interest rates from the banking company before putting your signature on a contract.
When you have to use any ATM unit, have knowledge of your surroundings. If you do not feel comfortable at a certain area, look for a different one. There are many ATM's all over Europe.